A multi-modules all-fiber terahertz spectrum system has been designed and built to meet the requirement of accurate identification for the different forms of flammable and explosive dangerous articles in the anti-terrorism goods detection. After that, two different forms of flammable and explosive dangerous goods have been detected to test the system. The results of the test clearly showed that all of the dangerous goods detected by the terahertz spectrum system have obvious characteristic absorption peaks in the range of 0.1～2 THz. On the basis of the detecting results which have been mentioned above, the flammable and explosive dangerous goods may be identified. What's more, it also offers a possible way for public safety inspection.